addLayer method Null safety

void addLayer(
  1. Layer layer
)

Adds a composited leaf layer to the recording.

After calling this function, the canvas property will change to refer to a new Canvas that draws on top of the given layer.

A RenderObject that uses this function is very likely to require its RenderObject.alwaysNeedsCompositing property to return true. That informs ancestor render objects that this render object will include a composited layer, which, for example, causes them to use composited clips.

See also:

  • pushLayer, for adding a layer and painting further contents within it.

Implementation

void addLayer(Layer layer) {
  stopRecordingIfNeeded();
  appendLayer(layer);
}